:root{
  --indigo:#5b5bf5;--indigo-d:#4242d6;--coral:#ff6b5b;--teal:#22c7b8;--amber:#ffb13c;
  --ink:#15132b;--ink-soft:#4a4766;--muted:#7b789a;--line:#e9e7f4;--cream:#fbfaff;--white:#fff;
  --shadow:0 12px 40px rgba(50,40,130,.10);--shadow-sm:0 2px 8px rgba(30,27,75,.06);
  --ok:#1d9e75;--warn:#d4537e;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'IBM Plex Sans Thai','Sora',system-ui,sans-serif;color:var(--ink);background:var(--cream);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,.dsp{font-family:'Sora','IBM Plex Sans Thai',sans-serif;letter-spacing:-.01em;line-height:1.3}
a{color:inherit;text-decoration:none}
.icon{width:24px;height:24px;stroke:currentColor;stroke-width:1.8;fill:none;stroke-linecap:round;stroke-linejoin:round}
.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
.muted{color:var(--muted)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:12px 22px;border-radius:999px;cursor:pointer;border:none;transition:.22s;font-family:inherit;white-space:nowrap}
.btn .icon{width:18px;height:18px;stroke-width:2.2}
.btn-primary{background:var(--indigo);color:#fff;box-shadow:0 8px 22px rgba(91,91,245,.32)}
.btn-primary:hover{background:var(--indigo-d);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--ink);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--indigo);color:var(--indigo)}
.btn-coral{background:var(--coral);color:#fff}
.btn-coral:hover{background:#f0503f;transform:translateY(-1px)}
.btn-sm{padding:8px 15px;font-size:13.5px}
.btn-block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}

/* top nav */
.topnav{position:sticky;top:0;z-index:50;background:rgba(251,250,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.topnav .row{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:'Sora',sans-serif;font-weight:800;font-size:20px;letter-spacing:-.03em}
.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--indigo),#7b6bff);display:flex;align-items:center;justify-content:center;box-shadow:0 6px 16px rgba(91,91,245,.4)}
.brand-mark svg{width:21px;height:21px;stroke:#fff;stroke-width:8;fill:none;stroke-linecap:round}
.navlinks{display:flex;align-items:center;gap:8px}
.navlinks a{font-size:14.5px;font-weight:600;color:var(--ink-soft);padding:8px 13px;border-radius:999px;transition:.2s}
.navlinks a:hover,.navlinks a.on{color:var(--indigo);background:#eef0ff}
.avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--coral),var(--amber));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;cursor:pointer}
@media(max-width:620px){.navlinks a span.lbl{display:none}}

/* page header */
.page{padding:40px 0 70px}
.page-head{margin-bottom:30px}
.page-head h1{font-size:clamp(26px,3.4vw,36px);font-weight:800;margin-bottom:6px}
.page-head p{color:var(--ink-soft);font-size:16px}

/* cards / grid */
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-sm)}
.card.pad{padding:24px}

/* course card */
.course{display:flex;flex-direction:column;overflow:hidden;transition:.25s}
.course:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.course .top{height:96px;display:flex;align-items:center;justify-content:center;color:#fff}
.course .top .icon{width:38px;height:38px}
.course .body{padding:20px;display:flex;flex-direction:column;flex:1}
.course h3{font-size:18px;font-weight:700;margin-bottom:6px}
.course .sub{font-size:13.5px;color:var(--ink-soft);margin-bottom:16px;flex:1}
.course .foot{display:flex;align-items:center;justify-content:space-between;gap:10px}
.price{font-family:'Sora',sans-serif;font-weight:800;font-size:20px;color:var(--ink)}
.tagpill{font-size:11.5px;font-weight:700;padding:4px 10px;border-radius:999px}
.tag-ok{background:#e7faf7;color:var(--ok)}

/* forms */
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--ink-soft);margin-bottom:6px}
.input{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;font-family:inherit;font-size:15px;background:var(--cream);outline:none;transition:.2s}
.input:focus{border-color:var(--indigo);background:#fff}
.authbox{max-width:420px;margin:50px auto;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:34px}
.tabs{display:flex;background:#f1f0fb;border-radius:12px;padding:4px;margin-bottom:24px}
.tabs button{flex:1;border:none;background:none;padding:9px;border-radius:9px;font-family:inherit;font-weight:600;font-size:14.5px;color:var(--muted);cursor:pointer}
.tabs button.on{background:#fff;color:var(--indigo);box-shadow:var(--shadow-sm)}
.msg{font-size:13.5px;padding:10px 13px;border-radius:10px;margin-bottom:14px;display:none}
.msg.err{display:block;background:#fff0ee;color:#b23b27;border:1px solid #ffd4cc}
.msg.ok{display:block;background:#e7faf7;color:var(--ok);border:1px solid #b6ebde}

/* stat tiles */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow-sm)}
.stat .n{font-family:'Sora',sans-serif;font-size:30px;font-weight:800;color:var(--indigo);line-height:1}
.stat .l{font-size:13px;color:var(--ink-soft);margin-top:7px}

/* progress bar */
.bar{height:8px;background:#ecebfb;border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--indigo),var(--teal));border-radius:99px}

/* table */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th{text-align:left;font-size:12.5px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:10px 12px;border-bottom:1px solid var(--line)}
.tbl td{padding:13px 12px;border-bottom:1px solid var(--line)}
.badge{font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px}
.b-paid{background:#e7faf7;color:var(--ok)}
.b-pending{background:#fff3e6;color:#b8772a}

/* toast */
#toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 20px;border-radius:999px;font-size:14px;font-weight:600;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.3s;z-index:200}
#toast.show{opacity:1;transform:translateX(-50%)}

.empty{text-align:center;padding:60px 20px;color:var(--ink-soft)}
.empty .icon{width:48px;height:48px;color:var(--line);margin:0 auto 16px}

@media(max-width:860px){.g3{grid-template-columns:1fr 1fr}.stats{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.g3,.g2{grid-template-columns:1fr}}